Windows Operating System Versions

This book covers the two most recent versions of the Microsoft Windows operating system based on the Windows NT code base: Windows Vista (32-bit and 64-bit versions) and Windows Server 2008 (32-bit and 64-bit versions). Unless specifically stated, the text applies to all versions. As background information, Table 1-1 lists the releases of the Windows NT code base, their internal version number, and the external product name.

Table 1-1. Windows Operating System Releases

Product Name

Internal Version Number

Release Date

Windows NT 3.1

3.1

July 1993

Windows NT 3.5

3.5

September 1994

Windows NT 3.51

3.51

May 1995

Windows NT 4.0

4.0

July 1996

Windows 2000

5.0

December 1999

Windows XP

5.1

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